Resources Contact Us Home
Control system for permanent magnet synchronous motor

Image Number 14 for United States Patent #5854547.

To provide a control system for a permanent magnet synchronous motor which can ensure stability of the current control system, even if the revolution frequency of the motor becomes higher and the terminal voltage of the motor exceeds the inverter maximum output voltage. In this method, when the revolution frequency of the motor exceeds a specified value, the size of the voltage vector is made a specified voltage vector, and a modulation factor based on its value is obtained. At the same time, a magnetic flux direction current correction value is found based on the size of a voltage vector from a polarity coordinates conversion unit and the above specified voltage vector size. Then, the magnetic flux direction current instruction is corrected by that value.

  Recently Added Patents
Cantilever of scanning probe microscope and method for manufacturing the same, method for inspecting thermal assist type magnetic head device and its apparatus
Radio communication system, transmission apparatus, reception apparatus, and radio communication method in radio communication
Diazeniumdiolated phosphorylcholine polymers for nitric oxide release
Performance apparatus, a method of controlling the performance apparatus and a program recording medium
Photoelectric conversion module
System and method for enabling image recognition and searching of remote content on display
Conversion of 5-(chloromethyl)-2-furaldehyde into 5-methyl-2-furoic acid and derivatives thereof
  Randomly Featured Patents
Soft magnetic thin film, and magnetic head and magnetic recording device using the same
Method of manufacture of a trading card and the like using computer generated duplex template printing method
Interlevel interface for series powered IIL or SITL
Optical proximity correction of L and T shaped patterns on negative photoresist
Basketball basket and backboard assembly
Overflow spillway for dams, weirs and similar structures
Click based trading with market depth display
Safety spectacles
Thick-thin battery jar
Method of forming a mold and molding a micro-device